McDonald’s ongoing effort to simultaneously appear to offer healthier food and attract hungry customers has resulted in a tentative partnership with yogurt maker Chobani. The AP reports that around 800 McDonald’s locations in California will be testing parfaits and smoothies made using the popular Greek-style yogurt.

A spokesperson for the fast food giant confirmed the tests, but said it was “very premature to determine if it may expand,” beyond the California region.

Restaruants taking part in the tests have started offering a “Simple Delights Menu” that consists of the Chobani-made smoothies, yogurt parfaits, and other healthy food options like apple slices.